Carrier Furnace - Manual (Page 23)

A CAUTION
CUT HAZARD
Failure to follow this caution may result in personal injury.
Although special care has been taken to minimize sharp
edges, be extremely careful when handling parts or reaching
into the furnace. Wear safety glasses, gloves, and
appropriate protective clothing.
FILTERING OUT TROUBLE
NOTE: The manufacturer has specified filters which will enable
your furnace to provide lasting comfort and efficiency throughout
its life. Contact your dealer to help you choose filters for your
furnace that both collect dirt before it enters your furnace, as well
as provide a low resistance to circulating air. Avoid filters that
report high cleaning efficiencies, but do not allow air to pass easily
through them.
^ CAUTION
UNIT PERFORMANCE HAZARD
Failure to follow this caution may result in unit component
damage.
Never operate your furnace without a filter in place. Doing
so
may damage the furnace blower motor. An
accumulation of dust and lint on internal parts of your
furnace can cause a loss of efficiency.
A, CAUTION
PERSONAL INJURY HAZARD
Failure to follow this caution may result in personal injury.
Use care when cutting support rods in filters to protect against
flying pieces and sharp rod ends. Wear safety glasses, gloves,
and appropriate protective clothing.
A dirty filter will cause excessive stress on the furnace, heat
exchanger, and blower motor, and can cause it to overheat and
automatically shut down. The furnace filter should be checked
every four weeks and be cleaned or replaced if necessary.
If installed with factory-specified disposable media filter, check or
replace filter before each heating and cooling season. Replace
disposable media filter at least once a year.
If your furnace filter needs replacing, be sure to use the same size
and type of filter that was originally specified.
The air filter for the furnace may be located in an external filter
cabinet attached to the side or bottom of the furnace casing. If the
air filter has been installed in another location, contact your dealer
for instructions. To inspect, clean and/or replace the air filter(s),
follow these steps:
1. Turn off electrical supply to the furnace. See Fig. 20.
2. Remove air filter from the filter cabinet.
a. Remove filter cabinet door. (See Fig. 21 and 22.)
NOTE: It may be necessary to remove one thumbscrew.
b. Slide air filter out of furnace. Keep dirty side up (if
dirty) to avoid spilling dirt.
3. Inspect the filter. If torn, replace it.
NOTE: If a washable filter was supplied with the furnace and has
been replaced by:
• Disposable media filter--Do not clean. If dirty, replace
only with media filter having the same part number and
size. Install with airflow direction arrow pointing to­
wards blower.
• Electronic Air Cleaner (EAC), refer to the EAC Owner’s
Manual for maintenance information.
4. If washable filter, wash filter (if dirty) in a sink, bathtub, or
outside with a garden hose. Always use cold tap water. A
mild liquid detergent may be used if necessary. Spray water
through filter in the opposite direction of airflow. Allow fil­
ter to dry.
3. Reinstall clean air filter.
6. Turn on electrical supply to the furnace.
If your furnace air filter needs to be replaced, be sure to use a
factory-authorized filter of the same size that was originally
specified. Use the filter tables and compare your furnace size with
the proper filter size.
Fig. 20 - Turn Off Electrical Supply
Fig. 21
A0022S
Removal of Filter Cabinet Door from Side Blower
Cabinet